rundll32: fix documentation and add more detail

[nir9]

Problem: Current rundll32 documentation contains incorrect information and lacks information about the syntax.

Example: Currently, the doc claims that rundll32 loads only 32bit DLLs which is untrue, I have tested with a 64bit Windows 10 machine and when rundll32 is ran regularly is loads 64bit DLLs and when it is ran through SysWow64 like so for example C:\Windows\SysWow64\rundll32 kernel32,Beep it of course uses 32bit DLLs

Here is a screenshot from procexp that shows it uses the 64bit DLL:

Solution:

• Remove 32bit only claim
• Remove claim that it requires admin rights (not needed necessarily)
• Add full syntax information and additional remarks

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@nir9 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

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Learn Build status updates of commit 79ab8c0:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
WindowsServerDocs/administration/windows-commands/rundll32.md	⚠️Warning		Details

WindowsServerDocs/administration/windows-commands/rundll32.md

• Line 38, Column 69: [Warning: file-not-found - See documentation] Invalid file link: 'windows/win32/learnwin32/winmain--the-application-entry-point'.

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[v-dirichards]

@robinharwood, @Xelu86
Can you review the proposed changes?

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team
#assign: @robinharwood, @Xelu86

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[learn-build-service-prod]

Learn Build status updates of commit 5fe4345:

✅ Validation status: passed

File	Status	Preview URL	Details
WindowsServerDocs/administration/windows-commands/rundll32.md	✅Succeeded

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PRMerger Results

Issue	Description
File Change Percent	This PR contains file(s) with more than 30% file change.